Appendix j analog-input block, Appendix j: analog-input block, D appendix j: analog-input block – Emerson Process Management ROSEMOUNT 5300 User Manual

Page 307: Rosemount 5300 series

Reference Manual

00809-0100-4530, Rev BA
July 2009

J-1

Rosemount 5300 Series

Appendix J

Analog-Input Block

Figure J-1. Analog-Input Block

The Analog Input (AI) function block processes field device measurements
and makes them available to other function blocks. The output value from the
AI block is in engineering units and contains a status indicating the quality of
the measurement. The measuring device may have several measurements or
derived values available in different channels. Use the channel number to
define the variable that the AI block processes.

The AI block supports alarming, signal scaling, signal filtering, signal status
calculation, mode control, and simulation. In Automatic mode, the block’s
output parameter (OUT) reflects the process variable (PV) value and status.
In Manual mode, OUT may be set manually. The Manual mode is reflected on
the output status. A discrete output (OUT_D) is provided to indicate whether a
selected alarm condition is active. Alarm detection is based on the OUT value
and user specified alarm limits. Figure J-2 on page J-4 illustrates the internal
components of the AI function block, and Table J-1 lists the AI block
parameters and their units of measure, descriptions, and index numbers.

OUT=The block output value and status
OUT_D=Discrete output that signals a selected
alarm condition

OUT_D

OUT